This is an ant like bug I found at work. It's often called a velvet ant, cow ant or cow-killer ant, but it isn't an ant at all. It's actually a wingless wasp. In fact, only the females of this species are wingless. This sting is said to be extremely painful and the species is able to give off a screeching sound from it's abdomen that sounds a lot like a high pitched cicada. The exoskeleton is very tough, which makes the bug very hard to crush. This is an adaptation that allows this bug to enter the nests of other wasps and bees without injury.

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Yeah, but they don't fly, so they are easy to get away from. Truth be told, they actually aren't ants, but the female of a wasp species. The males are said to have wings and look quite different. I've never seen one myself, though, or if I have I wouldn't have recognized it as the same species.